但是我们在腾讯云上已经转为MP4了啊

//生成当前时间的十六进制数
String t = getT();
//生成随机请求标识
String us = generateUS();
//获取签名
String sign = getSign(video.getVideoUrl(), t, us);
//获取原始URL的防盗链URL
video.setVideoUrl(video.getVideoUrl()+"?t="+t+"&us="+us+"&sign="+sign);

private static String getT(){
    Long time = System.currentTimeMillis() / 1000 + 5 * 3600;
    String fiveHoursLaterHexTime = Long.toHexString(time);
    return fiveHoursLaterHexTime;
}

private static String generateUS() {
    return RandomStringUtils.randomAlphanumeric(RandomUtils.nextInt(5, 20));
}

private static String getSign(String url,String time, String us){
    StringBuffer sb = new StringBuffer();
    sb.append(TENCENT_CLOUD_KEY);
    sb.append("/");
    for(int i = 0; i < 3; i++){
        url = url.substring(url.indexOf("/")+1 );
    }
    url = url.substring(0,url.lastIndexOf("/")+1);
    sb.append(url);
    sb.append(time);
    sb.append(us);
    String encodeStr= DigestUtils.md5Hex(sb.toString());
    return encodeStr;
}

生成的防盗链URL例：

mp4格式生成的防盗链URL：

http://1255877643.vod2.myqcloud.com/d1876a4fvodgzp1255877643/183922d05285890780845345712/vIenSs1J6hQA.mp4?t=5bdfe73f&us=fcveFN6LlnJh&sign=9bd1edabadccd2055f2c0514e35ddb79

mpg格式生成的防盗链URL：http://1255877643.vod2.myqcloud.com/d1876a4fvodgzp1255877643/98a8c1f95285890782762132979/lqlcF8PqOGwA.mpg?t=5bdfe828&us=vCWFUAljy6fkv0jQS&sign=6dffe0bc400cea4d62f74d96afe0eac4